I have a 1999 Jeep Grand Cherokee. Just about four weeks ago the vehicle started running hot. I immediately started checking things and replaced the radiator cap. It seemed fine for the next few days. Once again started running hot so checked it out and the fan had gone out. I had it replaced about two weeks ago and yesterday the fan went out again. What could be the cause?
More info:
1. Checked the fan the first time by running a hotwire and fan did not come on. Replaced fan. (Never overheated) Jeep ran great until yesterday, except for some dimming of the lights, similar to when the alternator is going out. Could be coincidence....just started happening within past month.
2. Checked all fuses, coolant levels, allowed the vehicle to warm up and turned air on and fan does not come on. Have not run hotwire yet this time, but everything is same as last time.
3. Jeep only runs hot when idling.
4. Vehicle has 78,000 miles, no other issues, had all recommended servicing since new
2007-03-12 03:00:39 · 6 answers · asked by Amy 2 in Cars & Transportation ➔ Maintenance & Repairs
most likely the fan relay
2007-03-12 03:04:25 · answer #1 · answered by Robert P 6 · 0⤊ 0⤋
Well by golly I see you don't have a book.
Get a Haynes Repair Manual at the local Auto Zone or auto parts store in your area. It will troubleshoot and show you how to fix your vehicle. Also on the Auto Zone site has a section for vehicle maintenance
Anyway, the vehicle has a fan thermostat that turns the fans on and off. This is probably what is wrong. Now after you fix the fans and they work and the vehicle gets hot. Then you need to get the radiator cored out.
2007-03-12 10:06:22 · answer #2 · answered by Big C 6 · 0⤊ 0⤋
Check the fan & relay, if OK, check the temp. sensor. If it's not working it won't tell the fan to come on. While driving you have enough air flow across the radiator to keep it from running hot during mild temperatures with out the fan on. That it why it gets hot while idling. Lack of air flow is your number one concern.
2007-03-12 10:25:45 · answer #3 · answered by gejandsons 5 · 0⤊ 0⤋
More than likely it's the relay switch. You can check it with a noid light. Just unplug the fan and test the male end of the connection. If that's good, then reconnect the fan and check the current at the fan. If there's no current there, then it's the relay.
2007-03-12 10:08:22 · answer #4 · answered by Derek D 2 · 0⤊ 0⤋
Cooling fan switch may be bad, or relay. I belive the cooling fan switch on a jeep is located at the bottom of the radiator.
2007-03-12 11:00:51 · answer #5 · answered by John 2 · 0⤊ 0⤋
just for laughs check the battery termanals.
2007-03-12 10:05:49 · answer #6 · answered by Anonymous · 0⤊ 1⤋